(19)

(11)

EP 0 331 686 A1

(12)

(43) Date of publication: 13.09.1989 Bulletin 1989/37 (21) Application number: 88905986.0 (22) Date of filing: 18.07.1988

(51) International Patent Classification (IPC):  E06B 5/ 02( . ) E06B 9/ 02( . ) (86) International application number: PCT/GB1988/000575 (87) International publication number: WO 1989/000637 (26.01.1989 Gazette 1989/03)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (30) Priority: 17.07.1987 GB 19870016960 28.11.1987 GB 19870027909 28.11.1987 GB 19870027910 29.01.1988 GB 19880002042 (71) Applicant: WATT, Ronald William Glasgow G11 7LG (GB)	(72) Inventor: WATT, Ronald William Glasgow G11 7LG (GB) (74) Representative: Allen, William Guy Fairfax, et al  J.A. KEMP & CO. 14 South Square Gray's Inn London WC1R 5LX London WC1R 5LX (GB)